What should I do if there is a harsh noise or the microphone howls during a live stream?

There are numerous reasons for squealing. Please check the following causes one by one: faulty microphone, excessive current, problematic motherboard sound card, or interference from nearby electronic devices.
You can refer to the solutions mentioned in this article.Article link
1. Try replacing the microphone to rule out device issues.
2. Keep the microphone away from external speakers and other audio - output devices to avoid interference.